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Re: [Qemu-devel] kvmclock, Migration, and NTP clock jitter
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] kvmclock, Migration, and NTP clock jitter |
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Date: |
Thu, 15 Jan 2015 18:27:54 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
On 15/01/2015 17:39, Mohammed Gamal wrote:
> The increase in the jitter and offset values is well within the 500 ppm
> frequency tolerance limit, and therefore are easily corrected by
> subsequent NTP clock sync events, but some live migrations do cause much
> higher jitter and offset jumps, which can not be corrected by NTP and
> cause the time to go way off. Any idea why this is the case?
It might be fixed in QEMU 2.2.
See https://lists.gnu.org/archive/html/qemu-devel/2014-09/msg01239.html
Paolo